* {
  box-sizing: border-box;
}

:root {
  color-scheme: light;
  --page-bg: #f4f8f7;
  --page-ink: #172033;
  --page-muted: #667085;
  --page-subtle: #77818e;
  --page-primary: #176b5f;
  --page-primary-soft: #e5f5f1;
  --page-surface: rgba(255, 255, 255, 0.86);
  --page-panel: rgba(255, 255, 255, 0.64);
  --page-line: #dbe6e5;
  --page-warning-ink: #74591d;
  --page-warning-bg: #fff7dc;
  --page-warning-line: #ecd99d;
  --page-glow-primary: rgba(82, 190, 166, 0.2);
  --page-glow-secondary: rgba(65, 111, 166, 0.13);
  --page-avatar-ink: #ffffff;
  --page-shadow: 0 22px 55px rgba(29, 56, 67, 0.09);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --page-bg: #0d121a;
  --page-ink: #edf3f8;
  --page-muted: #a6b3c1;
  --page-subtle: #8995a5;
  --page-primary: #70cfbc;
  --page-primary-soft: #173c36;
  --page-surface: rgba(21, 28, 38, 0.9);
  --page-panel: rgba(21, 28, 38, 0.72);
  --page-line: #303b49;
  --page-warning-ink: #e5ce93;
  --page-warning-bg: #302b1d;
  --page-warning-line: #50452b;
  --page-glow-primary: rgba(82, 190, 166, 0.1);
  --page-glow-secondary: rgba(65, 111, 166, 0.1);
  --page-avatar-ink: #102a26;
  --page-shadow: 0 24px 70px rgba(0, 0, 0, 0.4);
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--page-ink);
  background:
    radial-gradient(circle at 14% 10%, var(--page-glow-primary), transparent 30%),
    radial-gradient(circle at 88% 28%, var(--page-glow-secondary), transparent 31%),
    var(--page-bg);
}

.skip-link {
  position: fixed;
  z-index: 20;
  top: 10px;
  left: 10px;
  padding: 9px 12px;
  color: #fff;
  background: var(--page-primary);
  border-radius: 8px;
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: none;
}

.site-header,
footer {
  display: flex;
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  align-items: center;
  justify-content: space-between;
}

.site-header {
  min-height: 82px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: inherit;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  color: var(--page-primary);
  background: var(--page-primary-soft);
  border-radius: 12px;
}

.brand-mark svg {
  width: 27px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2;
}

.brand > span:last-child,
.account-strip > span:last-child {
  display: grid;
}

.brand small,
.account-strip small {
  color: var(--page-muted);
  font-size: 11px;
}

.back-link,
.login-notice a {
  color: var(--page-primary);
  font-size: 13px;
  font-weight: 800;
  text-decoration: none;
}

.purchase-shell {
  width: min(1180px, calc(100% - 40px));
  margin: clamp(25px, 5vw, 65px) auto 45px;
}

.purchase-heading {
  max-width: 740px;
  margin: 0 auto 30px;
  text-align: center;
}

.eyebrow {
  color: var(--page-primary);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

h1 {
  margin: 10px 0 12px;
  font-size: clamp(34px, 6vw, 58px);
  letter-spacing: -0.055em;
  line-height: 1;
}

.purchase-heading > p,
.purchase-footnote {
  color: var(--page-muted);
  font-size: 14px;
  line-height: 1.65;
}

.purchase-heading .purchase-message {
  margin: 15px auto 0;
  padding: 10px 13px;
  color: var(--page-warning-ink);
  background: var(--page-warning-bg);
  border: 1px solid var(--page-warning-line);
  border-radius: 11px;
  font-size: 12px;
}

.account-strip,
.login-notice {
  display: flex;
  width: fit-content;
  max-width: 100%;
  margin: 19px auto 0;
  padding: 10px 13px;
  align-items: center;
  gap: 10px;
  background: var(--page-surface);
  border: 1px solid var(--page-line);
  border-radius: 13px;
  text-align: left;
}

.account-strip[hidden],
.login-notice[hidden] {
  display: none;
}

.avatar {
  display: grid;
  width: 35px;
  height: 35px;
  flex: 0 0 auto;
  place-items: center;
  color: var(--page-avatar-ink);
  background: var(--page-primary);
  border-radius: 10px;
  font-size: 12px;
  font-weight: 900;
}

.login-notice {
  flex-wrap: wrap;
  justify-content: center;
  color: var(--page-muted);
  font-size: 12px;
}

.purchase-card {
  padding: clamp(18px, 3vw, 30px);
  background: var(--page-panel);
  border: 1px solid var(--page-line);
  border-radius: 25px;
  box-shadow: var(--page-shadow);
  backdrop-filter: blur(12px);
}

.purchase-footnote {
  max-width: 680px;
  margin: 18px auto 0;
  font-size: 11px;
  text-align: center;
}

footer {
  min-height: 65px;
  color: var(--page-subtle);
  border-top: 1px solid var(--page-line);
  font-size: 11px;
}

footer a {
  color: var(--page-muted);
  font-weight: 800;
  text-decoration: none;
}

@media (max-width: 560px) {
  .site-header,
  footer,
  .purchase-shell {
    width: min(100% - 24px, 1180px);
  }

  .site-header {
    min-height: 70px;
  }

  .brand small {
    display: none;
  }

  .back-link {
    font-size: 11px;
  }

  .purchase-shell {
    margin-top: 25px;
  }

  .purchase-card {
    padding: 14px;
    border-radius: 18px;
  }
}